Hi,
Closing a case is a custom action which opens the 'Resolve Case' window so this is not available in the Mobile Express client.
3rd party add-on products like
CWR Mobility enable the mobile users to close cases.
As a workaround, you could add a new 'active' status of 'Ready for Closure' which the mobile user could set via Mobile Express assuming you expose the Status Reason on the mobile form. A user or team who are running the CRM Web Client or Outlook
clients could then work from a view of 'Ready for Closure' cases and close them using the standard functionality OR you could add a workflow to change the status to Resolved.
Rob
Microsoft Certified Technology Specialist (CRM) GAP Consulting Ltd Microsoft Community Contributor Award 2011